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	Annual Toxics Summary Mexicali-Calzada Benito Juarez FAQs 1,3-Butadiene parts per billion

Read About Estimated Risk

Year	Months Present	Minimum	Median	Mean	90th Percentile	Maximum	Standard Deviation	Number of Observations	Detection Limit	Estimated Risk
2025		*	*	*	*	*	*	0	*	*
2024		*	*	*	*	*	*	0	*	*
2023		*	*	*	*	*	*	0	*	*
2022		*	*	*	*	*	*	0	*	*
2021		*	*	*	*	*	*	0	*	*
2020		*	*	*	*	*	*	0	*	*
2019		*	*	*	*	*	*	0	*	*
2018		*	*	*	*	*	*	0	*	*
2017		*	*	*	*	*	*	0	*	*
2016		*	*	*	*	*	*	0	*	*
2015		*	*	*	*	*	*	0	*	*
2014		*	*	*	*	*	*	0	*	*
2013		*	*	*	*	*	*	0	*	*
2012		*	*	*	*	*	*	0	*	*
2011		*	*	*	*	*	*	0	*	*
2010		0.07	*	*	*	0.37	0.133	5	0.04	*
2009		0.02	*	*	*	1.6	0.508	9	0.04	*
2008		0.12	*	*	*	0.12	0.660	1	0.04	*
2007		0.18	*	*	*	1.5	0.660	3	0.04	*
2006		0.06	0.41	*	1.35	2.2	0.657	16	0.04	*
2005		0.02	0.20	*	1.2	1.7	0.519	17	0.04	*
2004		0.02	*	*	*	1.5	0.519	10	0.04	*
2003		0.02	0.22	*	1.34	1.9	0.581	17	0.04	*
2002		0.05	0.86	*	2.5	5.0	1.39	19	0.04	*
2001		0.11	0.68	0.873	2.2	3.3	0.835	27	0.04	944
2000		0.12	0.43	0.714	1.76	2.3	0.657	29	0.04	771
1999		0.14	0.35	1.16	3.32	3.9	1.25	29	0.04	1250
1998		0.11	0.57	*	1.53	6.0	1.48	28	0.04	*
1997		0.15	*	*	*	0.65	0.177	10	0.04	*
1996		*	*	*	*	*	*	0	*	*
1995		*	*	*	*	*	*	0	*	*
1994		*	*	*	*	*	*	0	*	*
1993		*	*	*	*	*	*	0	*	*
1992		*	*	*	*	*	*	0	*	*
1991		*	*	*	*	*	*	0	*	*
1990		*	*	*	*	*	*	0	*	*
1989		*	*	*	*	*	*	0	*	*

	Notes:	Values below the Limit of Detection (LoD) assumed to be ½ LoD. Means and risks shown only for years with data in all 12 months. "*" means there was insufficient or no data available to determine the value.